tests

wip #68

Job	Run time
collateral (diffcov)	50s
ci_setuptools (3.10, ubuntu-latest)	3m 42s
test (3.8, ubuntu-latest)	39s
collateral (docs)	30s
test (3.8, macos-latest)	1m 32s
test_cygwin (39, windows-latest)	4m 56s
test (3.8, windows-latest)	2m 43s
test (3.12, ubuntu-latest)	49s
test_msvc_mingw	2m 37s
test (3.12, macos-latest)	51s
test_msys2_mingw (mingw64, x86_64, gcc, g++)	2m 19s
test (3.12, windows-latest)	3m 0s
test_msys2_mingw (mingw32, i686, gcc, g++)	2m 37s
test (3.9, ubuntu-latest)	44s
test_msys2_mingw (ucrt64, ucrt-x86_64, gcc, g++)	2m 20s
test (3.10, ubuntu-latest)	52s
test_msys2_mingw (clang64, clang-x86_64, clang, clang++)	2m 18s
test (3.11, ubuntu-latest)	48s
test (pypy3.10, ubuntu-latest)	1m 43s
check	2s
release	0s
	35m 52s

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